On Sat, Jul 26, 2025 at 01:08:03AM +0300, Cristian Ciocaltea wrote:
> The VHCI platform driver aims to forbid entering system suspend when at
> least one of the virtual USB ports are bound to an active USB/IP
> connection.
>
> However, in some cases, the detection logic doesn't work reliably, i.e.
> when all devices attached to the virtual root hub have been already
> suspended, leading to a broken suspend state, with unrecoverable resume.
>
> Ensure the virtually attached devices do not enter suspend by setting
> the syscore PM flag. Note this is currently limited to the client side
> only, since the server side doesn't implement system suspend prevention.
>
> Fixes: 04679b3489e0 ("Staging: USB/IP: add client driver")
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
> ---
> drivers/usb/usbip/vhci_hcd.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
> index e70fba9f55d6a0edf3c5fde56a614dd3799406a1..b4b0ed5d64966214636b157968478600e2e4178a 100644
> --- a/drivers/usb/usbip/vhci_hcd.c
> +++ b/drivers/usb/usbip/vhci_hcd.c
> @@ -765,6 +765,17 @@ static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag
> ctrlreq->wValue, vdev->rhport);
>
> vdev->udev = usb_get_dev(urb->dev);
> + /*
> + * FIXME: A similar operation has been done via
> + * USB_REQ_GET_DESCRIPTOR handler below, which is
> + * supposed to always precede USB_REQ_SET_ADDRESS.
> + *
> + * It's not entirely clear if operating on a different
> + * usb_device instance here is a real possibility,
> + * otherwise this call and vdev->udev assignment above
> + * should be dropped.
> + */
> + dev_pm_syscore_device(&vdev->udev->dev, true);
> usb_put_dev(old);
>
> spin_lock(&vdev->ud.lock);
> @@ -785,6 +796,17 @@ static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flag
> "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
>
> vdev->udev = usb_get_dev(urb->dev);
> + /*
> + * Set syscore PM flag for the virtually attached
> + * devices to ensure they will not enter suspend on
> + * the client side.
> + *
> + * Note this doesn't have any impact on the physical
> + * devices attached to the host system on the server
> + * side, hence there is no need to undo the operation
> + * on disconnect.
> + */
> + dev_pm_syscore_device(&vdev->udev->dev, true);
> usb_put_dev(old);
> goto out;
>
>
> --
> 2.50.0
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
a patch that has triggered this response. He used to manually respond
to these common problems, but in order to save his sanity (he kept
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